Effects of Fuel Injection Method on Energy Efficiency and Emissions of SI Engine Fed with a Hydrogen-Rich Reformate Technion Israel Inst. of Technology

Format:

Book

Conference/Event

Author/Creator:

Thawko, Andy, author.

Contributor:

Eyal, Amnon

Persy, Shalom-Adam

Tartakovsky, Leonid

Conference Name:

SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

Various potential alternative fuels for internal combustion engines are studied nowadays to reduce dependency on fossil fuel. Hydrogen-rich reformate produced onboard as a result of joint operation of internal combustion engine with a high-pressure thermochemical recuperation system is a promising alternative gaseous fuel. This paper reports on effects of the reformate fuel injection method on energy efficiency and pollutant emissions of a single-cylinder SI engine with high compression ratio (16:1) at steady-state conditions. A comparison between port (PFI) and direct (DI) reformate injection is performed. Engine performance, combustion parameters and exhaust emissions are evaluated and analyzed. For both injection strategies, a similar efficiency improvement (up to 20%) compared to a diesel engine reference case is observed. This is a joint result of waste heat recovery and hydrogen combustion benefits. Experiment results show that gaseous pollutant emissions are reduced to ultra-low levels within a wide power range. However, an increase in particles formation is found with a DI method compared to PFI. The difference in particle formation between DI and PFI injection methods increases with engine load raise, and reaches up to 300% at maximal load. With PFI method, the lower engine volumetric efficiency, due to hydrogen induction into the intake manifold, results in maximal power output limitation and to abnormal combustion. Contrary, with DI strategy, achieving the maximal engine power is possible. The heat release rate with the reformate DI is significantly higher compared to PFI for the same excess air ratio. The higher in-cylinder turbulence induced by direct injection process compared to the premixed charge PFI counterpart, might result in a faster fuel burning. A direct-injection of a hydrogen-rich reformate shows a high potential of efficiency improvement and emissions reduction; though an additional research on reformate injection and combustion processes optimization, and ways of particles formation mitigation, is essential

Notes:

Vendor supplied data

Publisher Number:

2020-01-2082

Access Restriction:

Restricted for use by site license